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April 1 2013

Can B-vent terminate horizontally?

No.Per the sizing tables, all orientations must terminate vertically with a UL listed rain cap, otherwise the appliance may not vent properly.  However, sometimes it is permissible to vent a Category 1 appliance horizontally with B-vent if a certified flue gas exhaust fan (Exhausto, Tjerlund, Field Controls) is mounted on the exterior wall to pull the flue gases out.